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<a name="boost.log.exception_handler"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Class template exception_handler</span></h2>
<p>boost::log::exception_handler</p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../utilities.html#header.boost.log.utility.exception_handler_hpp" title="Header &lt;boost/log/utility/exception_handler.hpp&gt;">boost/log/utility/exception_handler.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> SequenceT<span class="special">,</span> <span class="keyword">typename</span> HandlerT<span class="special">&gt;</span> 
<span class="keyword">class</span> <a class="link" href="exception_handler.html" title="Class template exception_handler">exception_handler</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">HandlerT</span> <a name="boost.log.exception_handler.handler_type"></a><span class="identifier">handler_type</span><span class="special">;</span>  <span class="comment">// The exception handler type. </span>
  <span class="keyword">typedef</span> <span class="keyword">void</span>     <a name="boost.log.exception_handler.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>   <span class="comment">// The handler result type. </span>

  <span class="comment">// <a class="link" href="exception_handler.html#boost.log.exception_handlerconstruct-copy-destruct">construct/copy/destruct</a></span>
  <span class="keyword">explicit</span> <a class="link" href="exception_handler.html#idm34703-bb"><span class="identifier">exception_handler</span></a><span class="special">(</span><span class="identifier">handler_type</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="exception_handler.html#idm34694-bb">public member functions</a></span>
  <span class="keyword">void</span> <a class="link" href="exception_handler.html#idm34695-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm73115"></a><h2>Description</h2>
<p>An exception handler functional object. The handler aggregates a user-defined functional object that will be called when one of the specified exception types is caught. </p>
<div class="refsect2">
<a name="idm73118"></a><h3>
<a name="boost.log.exception_handlerconstruct-copy-destruct"></a><code class="computeroutput">exception_handler</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="idm34703-bb"></a><span class="identifier">exception_handler</span><span class="special">(</span><span class="identifier">handler_type</span> <span class="keyword">const</span> <span class="special">&amp;</span> handler<span class="special">)</span><span class="special">;</span></pre>
<p>Initializing constructor. Creates an exception handler with the specified function object that will receive the exception. </p>
</li></ol></div>
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<div class="refsect2">
<a name="idm73136"></a><h3>
<a name="idm34694-bb"></a><code class="computeroutput">exception_handler</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm34695-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Exception launcher. Rethrows the current exception in order to detect its type and pass it to the aggregated function object.</p>
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<th align="left">Note</th>
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<tr><td align="left" valign="top"><p>Must be called from within a <code class="computeroutput">catch</code> statement. </p></td></tr>
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<td align="right"><div class="copyright-footer">Copyright © 2007-2021 Andrey Semashev<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>).
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